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Finding the Fourth Proportional to 1,278.28, 1,763.72 and 718.64

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Solution

The fourth proportional to 1,278.28, 1,763.72 and 718.64 is: 991.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.28 : 1,763.72 = 718.64 : x
  2. Step 2: Convert to fraction form
    1,278.28/1,763.72 = 718.64/x
  3. Step 3: Cross multiply
    1,278.28x = 1,763.72 × 718.64
  4. Step 4: Simplify right side
    1,278.28x = 1,267,480.68
  5. Step 5: Solve for x
    x = 1,267,480.68/1,278.28
  6. Step 6: Final answer
    x = 991.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.